Considering a elimination of your Cummins N14 engine's exhaust system? A “delete,” generally referring to the deletion of Diesel Particulate Filters (DPFs) and Selective Catalytic Reduction (SCR) equipment https://medium.com/@MatthewArnoldd/maximizing-heavy-duty-diesel-engine-performance-through-smart-diagnostics-and-professional-ecm-16ec58885c4c?sharedUserId=MatthewArnoldd